#37417A
Closest named color: Dark Slate Blue (#483D8B). oklch(39.7% 0.096 273.7), rgb(55, 65, 122).
Aa
White text reads best on this color (9.54:1).
About this color
#37417A is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.096 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.041 away. White text reads best on it, at 9.54:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.19:1 |
| White text | 9.54:1 |
Values
| HEX | #37417A |
| RGB | rgb(55, 65, 122) |
| HSL | hsl(231, 38%, 35%) |
| OKLCH | oklch(39.7% 0.096 273.7) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #37417A | 9.54:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #37417A | 2.19:1 | Fails | Lc 12.0 | Not readable |
| #37417A text on white | 9.54:1 | AAA | Lc 91.9 | Preferred for body text |
| #37417A text on black | 2.19:1 | Fails | Lc -10.5 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 900.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#D0D8F4
oklch(88.5% 0.04 272.9)
-
Step 300
300
#B1BEF0
oklch(80.9% 0.072 273.3)
-
Step 400
400
#8A9BE9
oklch(70.8% 0.116 273.7)
-
Step 500
500
#6E80E2
oklch(63.1% 0.148 273.6)
-
Step 600
600
#5867D0
oklch(55.6% 0.161 273.9)
-
Step 700
700
#4855B4
oklch(49.1% 0.15 273.7)
-
Step 800
800
#3B4692
oklch(42.7% 0.125 273.7)
-
Step 900
900 (this color)
#37417A
oklch(39.7% 0.096 273.7)
-
Step 950
950
#1D2344
oklch(26.9% 0.062 273.8)
#37417A with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #28487C | 0.025 |
| Deuteranopia (no green cones) | #214379 | 0.027 |
| Tritanopia (no blue cones) | #184D57 | 0.085 |
| Achromatopsia (no color) | #454545 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37417A
#37417A
oklch(39.7% 0.096 273.7)
- #554500
#554500
oklch(39.6% 0.081 93.8)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #37417A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.041
- Twilight Blue #0A437A ΔE 0.042
- Cobalt #1E488F ΔE 0.044
- Light Navy #155084 ΔE 0.050
- Blueberry #464196 ΔE 0.052
- Dusk Blue #26538D ΔE 0.056
- Deep Sea Blue #015482 ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.062
Use #37417A in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.